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Simplifying 66 + -9a = 2(19 + 3a) 66 + -9a = (19 * 2 + 3a * 2) 66 + -9a = (38 + 6a) Solving 66 + -9a = 38 + 6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6a' to each side of the equation. 66 + -9a + -6a = 38 + 6a + -6a Combine like terms: -9a + -6a = -15a 66 + -15a = 38 + 6a + -6a Combine like terms: 6a + -6a = 0 66 + -15a = 38 + 0 66 + -15a = 38 Add '-66' to each side of the equation. 66 + -66 + -15a = 38 + -66 Combine like terms: 66 + -66 = 0 0 + -15a = 38 + -66 -15a = 38 + -66 Combine like terms: 38 + -66 = -28 -15a = -28 Divide each side by '-15'. a = 1.866666667 Simplifying a = 1.866666667
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